电机与控制应用2025，Vol.52Issue(6)：646-657,12.DOI:10.12177/emca.2025.042
抑制三相LCL型逆变器并网电流高次谐波的自适应电容电压全反馈方法
Adaptive Capacitor Voltage Full Feedback Scheme for Three-Phase LCL-Type Inverter to Suppress High-Order Harmonics of Grid-Connected Current
蒋天润 1蓝艺佳 2林名宇 3吕昊3
作者信息
- 1. 国网扬州供电公司,江苏 扬州 225009
- 2. 国网南京市高淳区供电公司,江苏 南京 211399
- 3. 南京工程学院 电力工程学院,江苏 南京 211167
- 折叠
摘要
Abstract
[Objective]The existing capacitor voltage full-feedback scheme for LCL-type inverters presents issues such as inadequate suppression capability for high-order harmonics.To address the contradiction between the actual harmonic suppression effect of the strategy in high frequency band and the stability of the system,an adaptive capacitor voltage full feedback method is proposed in this paper.[Methods]Firstly,the impact of digital time delay on the actual harmonic suppression performance of the capacitor voltage full-feedback scheme was analyzed,and a first-order inertia link was utilized to simulate the phase-frequency characteristics of the digital delay,compensating for phase deviations caused by neglecting digital delay in the full-feedback function.Secondly,virtual impedance correction method was proposed.By introducing an impedance coefficient into the second-order feedback loop,the equivalent virtual resistance was adjusted to ensure the stability of the grid-connected system and the lower limit of impedance coefficients that triggers system instability was theoretically derived.Subsequently,the influence of the impedance coefficient value on the actual harmonic suppression effect of the capacitor voltage full feedback strategy was analyzed.An adaptive impedance coefficient adjustment method was proposed,which was designed to dynamically regulate the impedance coefficient in response to real-time system harmonic content.The function of each module was elaborated in detail,with the specific parameter determination method for critical components provided.Finally,a 10 kVA grid-connected inverter prototype was developed to experimentally validate the efficacy of the proposed adaptive capacitor voltage full feedback scheme.[Results]Experimental results demonstrated that adaptive capacitor voltage full feedback schemes can adjust the impedance coefficient according to the harmonic content of the grid-connected current.This adaptive regulation ensures system stability while maintaining strong suppression efficacy against higher-order harmonics.[Conclusion]The proposed method effectively solves the contradiction between system stability margin and high harmonic suppression effect,significantly enhance the suppression capability of the capacitor voltage full-feedback strategy to high-order harmonics of the grid-connected current,which demonstrates strong applicability in the present weak grid environment with wide range of grid impedance variation and high randomness of harmonic distribution.关键词
并网逆变器/电容电压全反馈/谐波抑制/弱电网Key words
grid-connected inverter/capacitor voltage full feedback/harmonic suppression/weak grid分类
动力与电气工程引用本文复制引用
蒋天润,蓝艺佳,林名宇,吕昊..抑制三相LCL型逆变器并网电流高次谐波的自适应电容电压全反馈方法[J].电机与控制应用,2025,52(6):646-657,12.
